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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb055e3859e061c249d2cb392dc67da02aa22befcdb2652fe81a151237a20cb7' 
  AND token = '8++qKKcrrpAeURVg+euLq2DLckoFWPAea70igzlmzP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}